Antenna-circuit arrangement



June 12, 1928. 1,673,009

M. LATQUR ANTENNA CIRCUIT ARRANGEMENT Original Filed Aug. 19. 1921 INVENTOR- Qrmsmoua 4 & W

TTORNEY Patented June 12, 1928.

, UNITED STATES PATENT OFFICE.

- MARIUS LATOUR, OF PARIS, FRANCE, ASSIGNOR TO LATOUR CORPORATION, 01

JERSEY CITY, NEW JERSEY, A CORPORATION OF DELAWARE.

ANTENNA-CIRCUIT ARRANGEMENT.

Original application filed August 19, 1921, Serial No. 493,666, and in France November 11', 1915. Divided and this application filed September 25, 1923, Serial No. 664,681. Renewed June 23, 1926.

(GRANTED UNDER THE PROVISIONS THE ACT OF MARCH 3, 1921, 41 STAT. 1]., 1318.)

This application is a division of my application Serial No. 493,666, filed August 19, 1921, for antenna circuit arrangements.

In circuit arrangements suggested in .6 the past for supplying current to radio telegraphic antenna with cathodic generators the antenna-ground circuit is influenced in accordance with the known methods either by induction or branch connections W under the control of a local oscillatory antenna.

It is the object of the present invention to eliminate the phenomena whereby two Waves are sent out.

In accordance with the present invention the antenna circuit is connected directly into one of the circuits of the generator, whereby a single oscillatory circuit is obtained.

Referring to the accompanying drawing the circuit diagram therein shown illustrates an embodiment of this invention. The antenna A is connected to the end of, an inductance coil forming one of the windings of a transformer T. An.'-additi0nal inductance L and a condenser C' are connected in series with the winding T'andthe antenna Aone terminal of the condenser G being grounded. An auxiliary inductance E is connected in parallel with the condenser C "for the purpose of permitting the passage of direct current from the source X into the cathodic generator. The value of this inductance should be sufficiently high so that it will under no circumstances be travcrscd .by the high frequency current, in order to prevent the formation of an oscillatory. circuit h C. Preferably the inductance is provided with an iron core, whereby it will not occupy much space. The catlv odic generator D comprises a plate P which is connected to one terminal of the source X. a grid G and a filament Between the grid and plate there is inserted one winding circuit is the antenna-ground circuit including the antenna A, inductance L,. capacity C and one winding of the transformer T all connected in series. The circuit also includes the capacity between the antenna and ground. The frequency to which this circuit is tuned determines the frequency to which the whole circuit is tuned.

The circuit arrangement described may be used either as a transmitter or as a regenerative receiver. If used as a transmitter the circuit would of course be adjusted to oscillate and if used as a receiver it could be adjusted to operate regeneratively just below the oscillatlng stage. In the case of heterodyne reception it could be adjusted to oscillate while receiving. These adaptations are of course well understood by those skilled in the art and for that reason it is unnecessary to show any means either for producing audible signals or for indicating such signals.

Having described my invention,'what I claim is: 1.-In a signalling system, a thermionic device having a filament, a plate and a grid, an input circuit including an inductance connected between said grid and said filament, an output circuit lncludin a source of electromotiveforce, and an impedance coil connected between said plate and said filament, a condenser connected in shunt of said impedance, an antenna connected to said output circuit, said antenna including a second inductance coupled to said first mentioned inductance,'and a ground connection for said plate circuit.

2. In a signaling system, a thermionic device having a filament, a plate and a grid, an input circuit. including an inductance connected between saidgrid and said lilament,'an output circuit including a source of electroniotive force and an impedance coil provided with a magnetic core, said cutout circuit being connected between said p ate and said filament, a condenser connected in shunt of said impedance, an antenna connected to said output circuit, said antenna including a second inductance coupled to said first mentioned inductance, and a ground connection for said plate circuit.

3. in signaling system, a thermionic hit lltl ll device having a filament, a plate and a grid; said impedance, an antenna connected to said an i t i it i l di 0 an inductance output circuit at a point between said plate connected between vsaid grid and said filaand said impedance, said antenna including 10 ment, an output circuit including a source a second inductance coupled to said first 5 of electromotive force, and an impedance coil mentioned inductance, and a ground conconnected between said plate and said nection for said plate circuit.

filament, a condenser connected in shunt of I -MARIUS LATOUR. 

